Tony, On 10/3/2023 2:30 PM, Tony Luck wrote: > The Sub-NUMA cluster feature on some Intel processors partitions > the CPUs that share an L3 cache into two or more sets. This plays > havoc with the Resource Director Technology (RDT) monitoring features. > Prior to this patch Intel has advised that SNC and RDT are incompatible. > > Some of these CPU support an MSR that can partition the RMID > counters in the same way. This allows for monitoring features > to be used (with the caveat that memory accesses between different > SNC NUMA nodes may still not be counted accurately. Almost. For reference: https://lore.kernel.org/lkml/e350514e-76ed-14ea-3e74-c0852658182f@xxxxxxxxx/ No need to send a new series just for this, but this series does find itself at the back of my queue. > Note that this patch series improves resctrl reporting considerably > on systems with SNC enabled, but there will still be some anomalies > for processes accessing memory from other sub-NUMA nodes. > > Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx> Reinette
